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樓主: climbd94608	go [討論] 女人 [複製鏈接]

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墓光迷城

1^#

發表於 10-10-26 05:52 PM |顯示全部帖子

As Diminishing Marginal Rate of Substitution.

我要0.4/1 + 0.9/2 > 1/1 or 2/2 。

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[討論] 女人 [複製鏈接]